[Maths Class Notes] on Data Collection and Handling Pdf for Exam

• We can define data collection as the process of gathering and measuring information on variables of interest, in a systematic fashion that helps one to answer stated research questions, evaluate outcomes and test hypotheses.

• The data collection component of research is generally common to all fields of study including humanities, business, etc.

• The primary importance of data collection in any business process as it helps to determine many significant things about the performance of the company. So, the data collection process plays a vital role in all the streams. Depending on the type of data, the data collection method is divided into two categories ,

1. Primary Data Collection methods – It refers to the process of collecting data from first-hand sources like surveys, observations, experiments. It is further classified into qualitative and quantitative data collection methods.

 

2. Secondary Data Collection methods – It refers to collecting data from the given sources such as newspapers, journals, books, magazines, etc. It can be present either in the published or unpublished format. Published data are available in statistical and historical documents, public records, etc. Whereas, unpublished data include diaries, letters, etc. 

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The Importance of Ensuring Accurate and Appropriate Data Collection

Accurate and appropriate data collection is helpful for businesses and organisations to reach their business objectives. Accurate data collection is important because-

Organisations should understand the fact that data is equal to knowledge. The more data they will have, the better they can be in the position to make correct decisions and take advantage of new opportunities. Good data will also provide them with evidence and justifications that they require to make correct decisions. Without accurate data, organisations are more prone to make mistakes and reach the wrong conclusions.

Every organisation has inefficiencies and problems. Due to changes in the business environment and society, it is almost impossible for an organisation to run itself properly. Here’s when accurate data plays its role. Accurate data enables companies to identify problems at an early stage so they could be solved beforehand.

Data helps companies to determine short term problems. Moreover, it also provides relevant tools to form long term theories. Data can be considered as the building blocks of the business models that can further help to know the different aspects of the company.

To effectively implement the solutions, it is important to know what is happening in the different departments of the company. Accurate data enables them to do this.

Accurate data allows companies to increase their efficiency by eliminating their doubts. The most successful companies have both long and short term strategies in one place. Solid field data collection and analysis refers to putting sources in places where they require the most. Understanding what areas of the company require more attention will eventually help them to move forward. 

The Consequences from Improperly Collected Data –

What is Data Handling?

Data handling can be defined as the method of performing statistical analysis on the given data. Now, you would think, what is Data? Why do we need data? Data can be defined as individual pieces of information, information about a particular system. The average human body temperature measures 37oC, which is data. Data can be made useful by data collection, data organization and this data can finally be processed through data analysis and finally it is depicted with the help of graphs or charts.

For example if someone asks you how old you are, you reply to them with a number, correct. Do you know that you just handled data! Your age is a data, your height is a data and your roll numbers are all data! Now every single person in the world is constantly interacting with data and generating data; your messages, your mails all contain data in large quantities. 

What you handle day to day in our life is known as Raw Data and this kind of data by itself does not have any meaning until. Let’s take any test you may have recently had at the school. You have a fixed and you know the number of students in your class. The marks that you obtain are the data here. You can see that your marks by themselves don’t mean much to anyone but they do mean to you right? If I wanted to know how your class performed in the test then just your data is no good. It’s only when the data is organized and processed that it is useful to us.

  

What is a Collection of Data?

Collection of data is more important than organizing data is. Suppose that you want to find out the marks your friend has obtained in a particular test. So you go to your teacher and ask to have a look at his paper but your teacher says that he cannot give you the answer sheet and she can only tell you the marks. So your teacher tells you the marks in the subject and you note these marks down and go to your friend. On your way you suddenly notice that your friend has scored exactly the same marks as you have scored. Is this a coincidence? What happened here was that the teacher told you your own marks assuming that you were there to ask your marks. So the entire data you have collected is wrong. In the concept of data handling, it is extremely important to know what the same data is being collected for before we actually collect it.

Organization of Data

We know that data needs to be always presented in a contextual and an organized manner! Here’s an example, you must definitely have seen the old yellow pages. They were these huge books that used to have the name and number of every resident of a particular city. So that book contained the names and numbers of thousands of people. So if you go to a city you’ve never been to before and you want to meet any of your friends who you know live in that city, then all you need to do is flip through the yellow pages
and you’ll find his name and number there , this makes the task easy! 

To make such a book, you need a lot of numbers from a lot of people .Receiving numbers is the easy bit. If you send a bunch of people around the town enquiring for people’s phone numbers, soon enough you will have a considerable amount of data. For this data to be useful, the data will have to be arranged so that it helps in searching quickly. In the yellow pages, the names are arranged alphabetically which means you can easily look for it just like you would in a dictionary. That would help in tracking names down easily.

Types of Data-

Data handling methods can be performed based on the types of data. The data is generally classified into two types, such as:

1. Qualitative Data

2. Quantitative Data

Qualitative data can be defined as something that gives us descriptive information about something whereas quantitative data can be defined as something that gives numerical information about something. Here, the quantitative data can be further divided into two. They are discrete and continuous data. The discrete data can take only certain values, for example whole numbers. The continuous data can take a value within the provided range.

Qualitative data collection methods include observation method, interview method, questionnaire methods, schedules, etc.

1. Unstructured and structured observations

2. Uncontrolled and controlled observations

3. Non-participant, disguised and participant observations

• In the questionnaire method, a set of questions is provided to the respondent and he is asked to return it after filling in his replies. The questions should be printed in a definite order. The features of a good survey are:

1. Simple and short

2. Sequenced logically

3. Good appearance

4. Contains some space for answers

How to Represent Data?

The data can be usually represented in any one of the following ways:

1. Bar Graph

2. Line Graphs

3. Pictographs

4. Histograms

5. Stem and Leaf Plot

6. Dot Plots

7. Frequency Distribution

8. Cumulative Tables and Graphs